A power steering device for a commercial vehicle

Abstract

The utility model discloses a kind of power-assisted steering devices of commercial vehicle, it is related to the technical field of automobile steering.The utility model includes steering gear, fixed disc, pivot and gear store, the input end of steering gear is fixed with input shaft, the end of input shaft away from steering gear is fixed with meshing gear, both sides of meshing gear are movably connected with gear store, driving gear is rotatably connected in gear store, the end of meshing gear away from input shaft is fixed with fixed shaft, the end of fixed shaft away from meshing gear is fixed with fixed disc, the end of fixed disc away from fixed shaft is provided with pivot, pivot is fixed with swing arm on the circumferential side close to fixed disc, the end of swing arm away from pivot is provided with bayonet.The utility model is provided with steering gear, fixed disc, pivot and gear store, solve the problem that the torque auxiliary of power-assisted steering device of commercial vehicle cannot be dynamically adjusted according to steering resistance, and single power source has reliability risk, and cannot provide sufficient torque backup when needed.

Description

Technical Field

[0001] This utility model belongs to the field of automotive steering technology, and in particular relates to a power steering device for commercial vehicles. Background Technology

[0002] Power steering systems in commercial vehicles are systems that assist drivers in steering with external power, aiming to reduce driving fatigue and improve safety and comfort. Their development has mainly gone through three stages: the earliest and most widespread was the mechanical hydraulic power steering system, which uses an engine to drive a hydraulic pump for power. While technically mature and providing clear road feel, it continuously consumes engine power, leading to higher fuel consumption and maintenance issues such as oil leaks. The current mainstream technology is the electric power steering system, which completely eliminates the hydraulic mechanism, relying directly on an electric motor to provide assistance. This system has the lowest energy consumption, a compact structure, and a high degree of intelligence, easily achieving a variable assist feel of lightness at low speeds and stability at high speeds. It also integrates advanced driver assistance functions such as lane keeping assist and automatic parking, thus becoming standard equipment in the vast majority of new cars. However, power steering systems in automobiles still have the following drawbacks in actual use: Traditional power steering systems in commercial vehicles may use fixed or graded power steering modes, which cannot sense the actual resistance encountered by the driver when steering in real time. When high torque assistance is needed (such as low-speed maneuvering or sharp turns), the assistance may be insufficient, resulting in heavy steering. When only low torque assistance is needed (such as fine-tuning the direction during high-speed cruising), the assistance may be too large, resulting in a light steering feel and a lack of road feel. Secondly, if a commercial vehicle relies on only one motor or one hydraulic pump as a power assist source, a failure of this single source (such as motor burnout or pump leakage) will immediately lead to power assist failure and extremely heavy steering, which is a great safety hazard for heavy commercial vehicles. At the same time, the power of a single power assist source is limited and may not be able to provide sufficient torque under extreme operating conditions. Utility Model Content

[0003] The purpose of this utility model is to provide a power steering device for commercial vehicles. By setting up a steering gear, a fixed plate, a rotating shaft and a gearbox, it solves the problems that the torque assist of the power steering device in commercial vehicles cannot be dynamically adjusted according to the steering resistance, and that a single power assist source has reliability risks and cannot provide sufficient torque backup when needed.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to a power steering device for commercial vehicles, comprising a steering gear, a fixed disc, a rotating shaft, and a gear housing. An input shaft is fixed to the input end of the steering gear. A meshing gear is fixed to the end of the input shaft away from the steering gear. Gear housings are movably connected to both sides of the meshing gear, and drive gears are rotatably connected within each gear housing. The drive gears mesh with the meshing gear. A fixed shaft is fixed to the end of the meshing gear away from the input shaft. A fixed disc is fixed to the end of the fixed shaft away from the meshing gear. Stabilizing plates are symmetrically fixed to the end of the fixed disc away from the fixed shaft. A rotating shaft is provided at the end of the fixed disc away from the fixed shaft. A rotating arm is symmetrically fixed to the circumference of the shaft near the fixed plate. A slot is opened at the end of the rotating arm away from the rotating shaft. A compression spring is fixed on two surfaces opposite to the two sides of the stabilizer plate in the slot. One end of the input shaft of the steering gear is connected to the steering mechanism, and the other end is fixed to the meshing gear. A gear compartment is provided on each side of the meshing gear. The drive gear in the compartment meshes with the meshing gear to assist in driving the input shaft. The meshing gear is connected to the fixed plate through the fixed shaft. The stabilizer plate is symmetrically installed on the fixed plate. The rotating shaft is connected to the fixed plate through the rotating arm. A slot is provided at the end of the rotating arm. A compression spring is installed in the slot. The compression spring abuts against the two sides of the stabilizer plate, so that when the steering torque increases, the compression spring is compressed and the corresponding switch is triggered.

[0005] Furthermore, a mounting shell is fixed to the edge of the fixed disk away from the fixed shaft, and the stabilizing plate is disposed inside the mounting shell. The mounting shell is fixed to the edge of the fixed disk, and the stabilizing plate is placed inside the mounting shell, which serves to seal and protect the internal structure.

[0006] Furthermore, a forward / reverse control switch and a start / stop switch are fixed on opposite sides of the two stabilizer plates. The pressure spring is located outside the forward / reverse control switch and the start / stop switch and its end abuts against the stabilizer plate. The forward / reverse control switch and the start / stop switch are installed on opposite sides of the two stabilizer plates. The pressure spring is located outside the switch and abuts against the stabilizer plate. When the pressure spring is compressed, it can trigger the start / stop switch to make the two servo motors work synchronously, or adjust the motor direction through the forward / reverse control switch.

[0007] Furthermore, a fitting groove is fixed in the middle of the circumference of the rotating shaft, the mounting shell is movably connected in the fitting groove, a mounting plate is fixed at the end of the rotating shaft away from the fixed plate, a fitting groove is provided in the middle of the rotating shaft, the mounting shell is movably connected in the fitting groove, and a mounting plate is fixed at the other end of the rotating shaft for connecting the steering mechanism.

[0008] Furthermore, the gear compartment has an installation port on the side near the meshing gear, and the meshing gear is movably connected in the installation port. The installation port on the side of the gear compartment near the meshing gear ensures alignment and flexible operation during gear transmission.

[0009] Furthermore, a servo motor is fixed at the end of the gearbox away from the steering gear. The output shaft of the servo motor passes through the gearbox and is fixed to the drive gear. A mounting base is fixed at the bottom of the servo motor. The servo motor is fixed at the outer end of the gearbox. The motor output shaft is connected to the drive gear. A mounting base is provided at the bottom of the servo motor to fix the motor to the working plane and provide a stable drive source.

[0010] This utility model has the following beneficial effects: This invention solves the problems of power steering in commercial vehicles, such as the inability to dynamically adjust torque assistance based on steering resistance and the reliability risks associated with a single power source, by incorporating a steering mechanism, a fixed disc, a rotating shaft, and a gearbox. Steering resistance is transmitted to the rotating shaft through the steering mechanism, which in turn causes the rotating arm to compress the spring. The greater the resistance, the greater the compression of the spring. When the resistance increases to a preset threshold, the deformation of the spring is sufficient to trigger the start / stop switch, thereby activating the second servo motor and achieving synchronous power assistance from both motors. This significantly increases the auxiliary torque and enables on-demand distribution of power assistance proportional to steering resistance.

[0011] This invention solves the problem of insufficient torque backup in power steering systems of commercial vehicles by setting up a steering gear, a fixed plate, and a gearbox. Under normal circumstances, only one servo motor can be activated to provide basic assistance. When greater torque is needed or the main power steering unit fails (which can be switched through control logic), a second servo motor can be activated. When high torque is required, the two servo motors can work synchronously and drive the meshing gear together, thereby providing assistance torque far exceeding that of a single motor. This not only improves the maximum assistance capacity of the system, but also greatly enhances the reliability and safety of the system through redundancy design. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 A three-dimensional view of the assembly structure of a power steering system for a commercial vehicle; Figure 2 for Figure 1 Enlarged view of the structure at point A in the image; Figure 3 This is a three-dimensional structural diagram of the steering gear; Figure 4 A three-dimensional structural diagram of the fixed disk; Figure 5 This is a three-dimensional structural diagram of the rotating shaft; Figure 6 This is a three-dimensional view of the gear compartment after it has been partially cut open.

[0014] Figure label: 1. Steering gear; 101. Input shaft; 102. Meshing gear; 2. Fixed plate; 201. Mounting housing; 202. Stabilizing plate; 203. Forward / reverse control switch; 204. Start / stop switch; 205. Fixed shaft; 3. Rotating shaft; 301. Fitting groove; 302. Mounting plate; 303. Rotating arm; 304. Bayonet; 305. Compression spring; 4. Gear compartment; 401. Mounting port; 402. Drive gear; 403. Servo motor; 404. Mounting base. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Specific Implementation Example 1

[0016] Please see Figure 1-5This utility model relates to a power steering device for commercial vehicles, comprising a steering gear 1, a fixed disc 2, a rotating shaft 3, and a gearbox 4. An input shaft 101 is fixed to the input end of the steering gear 1. During operation, power is input to the input shaft 101, driving the vehicle steering mechanism connected to its output end to rotate. A meshing gear 102 is fixed to the end of the input shaft 101 away from the steering gear 1. During operation, the meshing gear 102 transmits the torque generated by the drive gear 402 to the input shaft 101. Gearboxes 4 are movably connected to both sides of the meshing gear 102. During operation, the drive gear 402 is connected within the gearboxes 4. Drive gears 402 are rotatably connected within the gearboxes 4, meshing with the meshing gear 102. The rotation of the drive gear 402 drives the meshing gear 102 to rotate, thus assisting the rotation of the input shaft 101. A fixed shaft 205 is fixed to the end of the meshing gear 102 away from the input shaft 101. The fixed shaft 205 connects to... Fixed disk 2 and meshing gear 102, fixed disk 2 is fixed to the end of fixed shaft 205 away from meshing gear 102. Fixed disk 2 is connected to stabilizing plate 202 and fixed shaft 205. Stabilizing plate 202 is symmetrically fixed to the end of fixed disk 2 away from fixed shaft 205. When stabilizing plate 202 is working, forward and reverse control switch 203 and start / stop switch 204 are connected to it. Rotating shaft 3 is provided at the end of fixed disk 2 away from fixed shaft 205. When rotating, rotating shaft 3 drives the fixed disk 2. When disk 2 rotates, rotating arms 303 are symmetrically fixed on the periphery of rotating shaft 3 near fixed disk 2. A bayonet 304 is opened at the end of rotating arm 303 away from rotating shaft 3. Compression springs 305 are fixed on two surfaces opposite to the two sides of the stabilizing plate 202 inside the bayonet 304. When rotating arm 303 rotates, the compression springs 305 in bayonet 304 and stabilizing plate 202 cause the compression springs 305 to press on the start / stop switch 204 when the torque needs to be increased, so that the two servo motors 403 work at the same time.

[0017] Specifically, a mounting shell 201 is fixed at the edge of the fixed disk 2 away from the fixed shaft 205. A stabilizing plate 202 is set inside the mounting shell 201. The fixed disk 2 encloses the stabilizing plate 202 through the mounting shell 201. The stabilizing plate 202 is set inside the mounting shell 201, which drives the mounting shell 201 to move.

[0018] Furthermore, a forward / reverse control switch 203 and a start / stop switch 204 are fixed on both sides of the two stabilizing plates 202 respectively. The forward / reverse control switches 203 and the start / stop switch 204 on the two stabilizing plates 202 are in opposite directions. The compression spring 305 is set on the outside of the forward / reverse control switches 203 and the start / stop switch 204 and its end abuts against the stabilizing plate 202. When the stabilizing plate 202 is pressed down by the start / stop switch 204, the two servo motors 403 are started to work synchronously. The working direction of the servo motors 403 is changed by the forward / reverse control switch 203.

[0019] Furthermore, a fitting groove 301 is fixed in the middle of the periphery of the rotating shaft 3, and the mounting shell 201 is movably connected in the fitting groove 301. The end of the rotating shaft 3 away from the fixed plate 2 is fixed with a mounting plate 302. When the rotating shaft 3 is working, it is connected and cooperated with the mounting shell 201 through the fitting groove 301, and the connecting mechanism of the steering mechanism is installed through the mounting plate 302.

[0020] The operation process of this embodiment is as follows: During operation, when the steering mechanism of the car is rotated, the steering torque is transmitted to the rotating shaft 3. The rotating shaft 3 drives the rotating arm 303 to rotate, and then the rotating arm 303 compresses the compression spring 305, causing the stabilizer plate 202 to rotate. During the rotation of the stabilizer plate 202, the fixed plate 2 rotates. When the required torque is large, the compression spring 305 receives greater pressure and is pressed against the forward / reverse control switch 203. When the steering resistance increases, after the compression spring 305 is initially compressed, it will first trigger the forward / reverse control switch 203. This switch controls the direction of rotation of the rotating arm 303 (corresponding to the driver turning left or right). (Right turn) Sets the rotation direction of the two servo motors 403. During normal turning, only one servo motor 403 works by default to provide basic assistance. When the resistance increases further, the compression spring 305 is further compressed, which will press down the start / stop switch 204, thereby starting the second servo motor 403, so that the two motors work synchronously to provide maximum assistance and determine the direction of the auxiliary servo motor 403. At the same time, after pressing the start / stop switch 204, the two servo motors 403 start rotating synchronously, controlling the two drive gears 402 to drive the meshing gear 102 to rotate, and assisting the input shaft 101 to rotate. Specific Implementation Example 2

[0021] Please see Figure 1-6 Based on the first specific embodiment, the gear compartment 4 has an installation port 401 on the side near the meshing gear 102, the meshing gear 102 is movably connected in the installation port 401, and the gear compartment 4 is movably connected to the meshing gear 102 through the installation port 401.

[0022] Specifically, a servo motor 403 is fixed at the end of the gearbox 4 away from the steering gear 1. The output shaft of the servo motor 403 passes through the gearbox 4 and is fixed to the drive gear 402. A mounting base 404 is fixed at the bottom of the servo motor 403. The gearbox 4 controls the rotation of the drive gear 402 through the power generated by the servo motor 403. The servo motor 403 is mounted on the working plane through the mounting base 404.

[0023] The operation process of this embodiment is as follows: During operation, when the steering control end starts to rotate, a servo motor 403 is started. The power generated by the servo motor 403 controls the rotation of the drive gear 402. In the rotation of the drive gear 402, the meshing gear 102 is driven to rotate. Through the rotation of the meshing gear 102, the torque is transmitted to the input shaft 101, which assists the rotation of the input shaft 101. After one of the start / stop switches 204 is pressed, another servo motor 403 is started. The two servo motors 403 synchronously drive the drive gears 402 in the two gear compartments 4 to rotate. In the rotation of the drive gears 402, the meshing gear 102 is driven to rotate, increasing the torque in the rotation of the input shaft 101.

[0024] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A power steering device for a commercial vehicle, comprising a steering gear (1), a fixed disc (2), a rotating shaft (3), and a gearbox (4), characterized in that: The input end of the steering gear (1) is fixed with an input shaft (101). A meshing gear (102) is fixed at the end of the input shaft (101) away from the steering gear (1). Gear compartments (4) are movably connected to both sides of the meshing gear (102). Drive gears (402) are rotatably connected inside the gear compartments (4). The drive gears (402) mesh with the meshing gears (102). A fixed shaft (205) is fixed at the end of the meshing gear (102) away from the input shaft (101). The fixed shaft (205) is located away from the meshing gear. A fixed plate (2) is fixed to one end of the gear (102). A stabilizing plate (202) is symmetrically fixed to the end of the fixed plate (2) away from the fixed shaft (205). A rotating shaft (3) is provided at the end of the fixed plate (2) away from the fixed shaft (205). A rotating arm (303) is symmetrically fixed to the circumference of the rotating shaft (3) near the fixed plate (2). A bayonet (304) is provided at the end of the rotating arm (303) away from the rotating shaft (3). A compression spring (305) is fixed on both sides of the bayonet (304) opposite to the two sides of the stabilizing plate (202).

2. The power steering device for a commercial vehicle according to claim 1, characterized in that: The mounting shell (201) is fixed at one end edge away from the fixed shaft (205) of the fixed disk (2), and the stabilizing plate (202) is disposed inside the mounting shell (201).

3. The power steering device for a commercial vehicle according to claim 1, characterized in that: Two forward / reverse control switches (203) and start / stop switches (204) are fixed on opposite sides of the two stabilizer plates (202). The forward / reverse control switches (203) and start / stop switches (204) on the two stabilizer plates (202) are in opposite directions. The compression spring (305) is located outside the forward / reverse control switches (203) and start / stop switches (204) and its end abuts against the stabilizer plate (202).

4. The power steering device for a commercial vehicle according to claim 2, characterized in that: A fitting groove (301) is fixed in the middle of the circumference of the rotating shaft (3), and the mounting shell (201) is movably connected in the fitting groove (301). The end of the rotating shaft (3) away from the fixed plate (2) is fixed with a mounting plate (302).

5. The power steering device for a commercial vehicle according to claim 1, characterized in that: The gear compartment (4) has an installation port (401) on the side near the meshing gear (102), and the meshing gear (102) is movably connected in the installation port (401).

6. The power steering device for a commercial vehicle according to claim 5, characterized in that: A servo motor (403) is fixed at one end of the gearbox (4) away from the steering gear (1). The output shaft of the servo motor (403) passes through the gearbox (4) and is fixed to the drive gear (402). A mounting base (404) is fixed at the bottom of the servo motor (403).

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